Dow - Building Solutions

Transcription

1 Uniclass EPIC L68151:P7111 F841:X722 CI/SfB (27) Rn7 (M2) May 2006 Dow - Building Solutions Insulating buildings with STYROFOAM

2 Contents Introduction About STYROFOAM 03 Developing your STYROFOAM Solution 03 Authority 03 Meeting environmental standards 03 Product Data Technical description 04 Performance 04 Products 05 Handling and Storage 06 Data Table 07 Part L 2006 Guidance 10 Insulating Inverted Flat Roofs Insulating Inverted roofs: basic principles 14 Insulating ballasted inverted roofs: design considerations (ROOFMATE MinK System) 18 Insulating ballasted inverted roofs: installation methods 23 Insulating lightweight inverted roofs: design considerations 24 Insulating Floors Basic principles 35 Insulating groundbearing floors: design 38 Insulating groundbearing floors: installation 44 Insulating suspended floors: design 45 Insulating suspended floors: installation 48 Renovating floors 49 Insulating Structures Below Ground Insulating structures below ground: design 50 Insulating structures below ground: installation 51 Insulating Walls 52 Insulating Single Ply Roofs 54 Insulating Pitched Roofs 56 Insulating Agricultural Buildings 60 References 62 Notes 64 Stockists 66 Insulating lightweight inverted roofs: installation methods 27 Insulating green roofs: design considerations 28 Insulating green roofs: installation methods 30 Insulating roofs for renovation projects: design considerations 31 ROOFMATE LG-X Project assessment sheet 34 Note Information contained in this brochure may be subject to change. When specifying STYROFOAM it is important to follow the most recent advice and recommendations. Contact Dow or visit our web site at 2

3 Introduction In the demanding conditions of today s building and engineering projects STYROFOAM blue extruded polystyrene boards can deliver the thermal performance and strength you require - for the lifetime of the structure. As a world-class producer of thermal insulation products, Dow can provide all the help, advice and information you need to achieve the solutions you re looking for. Dow has developed, for using STYROFOAM to maximum effect in a wide selection of typical application areas. About STYROFOAM STYROFOAM has been manufactured by Dow for more than 60 years. The process of extruding foamed polystyrene results in a material with uniformly small, closed cells, a smooth skin and an unrivalled set of properties which make it the choice of specifiers in a wide range of demanding insulation applications: low thermal conductivity - minimising the board thickness needed to achieve a specific U-value, thus allowing the designer greater flexibility. high compressive strength - in load-bearing applications, the closed cell structure gives the foam great rigidity and makes it highly resistant to compression. low water absorption - STYROFOAM has natural resistance to rain, snow, frost and water vapour which makes it an exceptionally stable material, which retains its initial insulation performance and physical integrity in exposed conditions over the very long term. It was this unusual property that made possible the inverted warm roof concept, pioneered by Dow. workability - STYROFOAM is easily worked with normal hand tools. hygiene - STYROFOAM boards have low susceptibility to rot, mould or fungal growth is therefore minimised. They are clean, odourless and free from irritating dust. STYROFOAM is available in a number of different grades designed to meet the performance requirements of specific applications. Developing your STYROFOAM Solution Each construction project has its own unique combination of insulation requirements. Developing an accurate insulation project specification can be a time-consuming process. However, the designer now has available a range of fast-track templates in the form of. You will find each STYROFOAM Solution detailed in a dedicated section of this manual. The STYROFOAM product range itself is described in the Product Data section. Further information is available on the web site at Authority STYROFOAM is manufactured under a BS EN ISO 9001:2001 Quality Assurance System (BSI Certificate Q05968). STYROFOAM products comply with BS EN 13164: 2001 Thermal insulation products for buildings - factory made products of extruded polystyrene (XPS) - specification. STYROFOAM products have been evaluated by the British Board of Agrément and certified as suitable for use in: Floors (Certificate 92/2782) Cavity walls (Certificate 88/2105). Pitched roofs - warm roof concept (Certificate 87/1836). Inverted roofs (Certificate 97/3431). Meeting environmental standards Concern about ozone depletion in the stratosphere has led to international agreements to phase out the use of ozonedepleting chemicals. All STYROFOAM products are hydrochlorofluorocarbon (HCFC) free and comply with the requirements of EC Regulation No 2037/2000 (1 Oct 2000) on substances which deplete the ozone layer. STYROFOAM `X products are foamed with a hydrofluorocarbon (HFC) and `A products with carbon dioxide. * Trademark of The Dow Chemical Company ("DOW") or an affiliated company of Dow 3

4 Product data Technical description Surface characteristics Dow STYROFOAM boards are blue. All boards have a smooth homogeneous skin on both sides with the exception of ROOFMATE LG-X and PERIMATE DI-A. Performance Structural STYROFOAM boards are available in a range of compressive strengths to suit different loadbearing requirements. Fire Information on aspects of fire performance of extruded polystyrene in building applications is given in BS 6203: 1991, 'Fire characteristics and fire performance of expanded polystyrene materials used in building applications'. STYROFOAM products contain a flame retardant additive to inhibit accidental ignition from a small fire source. STYROFOAM is, however, combustible and if exposed to an intensive fire may burn rapidly. During Shipment, storage, installation and use STYROFOAM products should not be exposed to flames or other ignition sources. Fire classification is based on small-scale tests, which may not reflect the reaction of the product in its end use state under actual fire conditions. Water/moisture STYROFOAM is highly resistant to water absorption. STYROFOAM boards are very resistant to the passage of water vapour and are unaffected by repeated freeze/thaw cycles. Biological STYROFOAM has low susceptibility to rot; mould or fungal growth is therefore minimised. Chemical STYROFOAM boards are resistant to most commonly occurring construction materials such as lime, cement, plaster, anhydrous gypsum, solvent-free bituminous compounds, water-based wood preservatives, as well as alcohols, acids and alkalis. Certain organic materials such as solvent-based wood preservatives, coal tar and derivatives (creosote), paint thinners and common solvents (e.g. acetone, ethyl acetate, petrol, toluene and white spirit) will attack STYROFOAM, resulting in softening, shrinkage and possible dissolution, with a consequent loss of performance. The use of solvent-free adhesives is recommended. Advice on compatibility with polystyrene foam should be sought from the adhesive manufacturers. STYROFOAM products should, when installed, be adequately protected from direct exposure to fire. STYROFOAM products achieve Euroclass E (reaction to fire). Temperature Polystyrene products will melt when brought into direct contact with high temperature heat sources: for Dow STYROFOAM boards the recommended maximum continuous operation temperature is 75 C. * Trademark of The Dow Chemical Company ("DOW") or an affiliated company of Dow 4

5 Product data Sunlight Protect STYROFOAM from prolonged exposure to intense sunlight to prevent degradation of the surface of the board. Durability Properly installed, STYROFOAM boards have a service life comparable with that of the building or structure. Environmental STYROFOAM is non bio-degradable and does not present an environmental hazard. Disposal STYROFOAM can be: recycled mechanically. recycled chemically. used as land-fill. incinerated under control to recover the energy content. Products FLOORMATE FLOORMATE is the STYROFOAM Solution for insulating floors. FLOORMATE insulation is available in a range of compressive strengths to match the loading requirements of individual projects. FLOORMATE insulation can be installed under or over the slab in groundbearing concrete floors and is suitable for use on suspended beam and block or timber floors. WALLMATE WALLMATE CW-X is the STYROFOAM Solution for insulating walls. WALLMATE CW-X insulation can be used as partial cavity fill without increasing the risk of water penetration. The low water absorption of WALLMATE CW-X insulation enables it to be used in walls without any loss of performance. WALLMATE CW-X boards are sized to co-ordinate with common brick and block sizes. Properties Standard Unit Value Specific heat kj/kgk 1.4 Coefficient of linear thermal expansion BS 4370: Part 3: 1988:Method 13 mm/mk 0.07 Working temperature range C -50 to +75 Fire classification: reaction to fire BS EN BS EN 13501: Euroclass E Table 01 Common properties of STYROFOAM products * Trademark of The Dow Chemical Company ("DOW") or an affiliated company of Dow 5

6 Product data: products ROOFMATE SL-X & LG-X ROOFMATE SL-X and ROOFMATE LG-X are the STYROFOAM Solutions for insulating inverted roofs. The boards are unaffected by the conditions encountered on flat roofs, including wide fluctuations in temperature or repeated freeze/thaw cycles. ROOFMATE SL-X insulation is intended for use on heavyweight decks with a ballast layer of gravel or concrete slabs. It can also be used in the ROOFMATE MinK system, which will reduce the rain water cooling penalty, thereby minimising the insulation thickness required. Its rot-resistance makes it ideal for insulating roof gardens. ROOFMATE LG-X boards have a 10mm modified concrete topping on the upper surface, eliminating the need for separate ballast and making it possible to gain the benefits of the inverted roof on lightweight decks. ROOFMATE RL X ROOFMATE RL-X is the STYROFOAM solution for insulating single-ply roof decks. ROOFMATE RL-X boards provide a lightweight, rigid substrate beneath light-coloured single-ply polymeric membranes on flat or low slope metal decked roofs. The large area and high dimensional stability of ROOFMATE RL-X boards minimise the installation time as well as the number of fixings required. CE marking (to BS EN 13164) FLOORMATE 200-X T1 CS(10/Y)200 - CC(2/1.5/50)60 - WL(T) DS(TH) STYROFOAM SP-X T1 CS(10/Y)300 - CC(2/1.5/50)120- WL(T) DS(TH) FLOORMATE 500-X T1 CS(10/Y)500 - CC(2/1.5/50)150 - WL(T) DS(TH) FLOORMATE 700-A T1 CS(10/Y)700 - CC(2/1.5/50)250 - WL(T)0.7 - WD(V)3 - FT2 - DS(TH) - DLT(2)5 WALLMATE CW-X T1 CS(10/Y)100 - WL(T) 0.7 -DS(TH) ROOFMATE RL-X T1 CS(10/Y)300 - WL(T) DS(TH) ROOFMATE SL-X T1 CS(10/Y)300 - CC(2/1.5/50)110 - WL(T) WD(V)3 - FT2 - DS(TH) - DLT(2)5 ROOFMATE LG-X T1 CS(10/Y)300 - CC(2/1.5/50)110 - WL(T)0.7 - WD(V)3 - FT2 DS(TH) - DLT(2)5 PERIMATE DI-A T1 CS(10/Y)300 - WL(T)0.7 - WD(V)3 - FT1 - DS(TH) ROOFMATE RL-X can also be used to insulate warm pitched roofs at rafter line. ROOFMATE RL-X boards are for installation above the rafters with ROOFMATE RL-X boards cut to size to fit between the rafters The insulation is supplied in large boards for rapid coverage. Insulation only PERIMATE DI-A PERIMATE DI-A is the STYROFOAM solution for insulating structure below ground. PERIMATE DI-A boards have vertical channels cut into one face, to drain water away, and a filter fabric bonded to the face to prevent soil particles blocking the channels. 6

7 Product data: data tables PERIMATE DI-A FLOORMATE 200-X STYROFOAM SP-X FLOORMATE 500-X FLOORMATE 700-A WALLMATE CW-X ROOFMATE RL-X ROOFMATE SL-X ROOFMATE LG-X FLOORS Domestic Medium load bearing High load bearing V high load bearing WALLS Partial fill cavity Below ground/basement ROOFS Pitched - insulation at rafter line Flat: inverted -ballasted -lightweight -terraced Flat: conventional warm AGRICULTURAL BUILDINGS Table 02 Product Selector Thickness mm PERIMATE DI-A FLOORMATE 200-X STYROFOAM SP-X FLOORMATRE 500-X FLOORMATE 700-A WALLMATE CW-X ROOFMATE RL-X ROOFMATE SL-X ROOFMATE LG-X Table 03 Declared thermal resistance (R D ) - m2k/w 7

8 Product data: data tables FLOORMATE 200-X STYROFOAM SP-X Properties Standard unit CE Code Thermal conductivity* 80mm >121 BS EN BS EN BS EN W/mK W/mK W/mK λd λd λd Compressive strength at 10% or break (90 days) Design load 2% max. deflection (50 years) BS EN 826 kn/m2 CS(10/Y)i BS EN 1606 kn/m2 CC(2/1.5/50) σ c Water vapour resistivity Water vapour diffusion resistance factor BS EN MNs/gm BS EN m MUi Water absorption Total immersion Diffusion Freeze/thaw, after 300 cycles BS EN BS EN BS EN % vol % vol % vol WL(T)i WL(V)i FTi < < Dimensional stability 48hrs at 70C/90% RH 168hrs at 40kPa/70C BS EN 1604 BS EN 1605 % % DS(TH) DLT(2)5 <2 - <2 - Density (aim) BS EN 1602 kg/m Dimensions Length Width Thickness BS EN 822 BS EN 822 BS EN 823 mm mm mm - - Ti , 30, 35, 40, 50, 60, 70, 80, 90, 100, 120, , 75 Fire classification reaction to fire BS EN BS EN Euroclass E E Appearance Surface Edge profile skin butt edge skin butt edge Application Floors - domestic Floors - medium load bearing Certification BBA Agrément / /2782 Table 04 Product data The properties given above are typical (unless stated otherwise). Results of tests described are available from Dow. * declared 90/90 value - BS EN ** includes 10 mm for the mortar topping; thicker products available on request up to 190 mm 8

9 Product data: data tables FLOORMATE 500-X FLOORMATE 700-A WALLMATE CW-X ROOFMATE RL-X ROOFMATE SL-X ROOFMATE LG-X PERIMATE DI-A <0.5 <3 <1 <0.5 <3 <1 < < < <0.5 <3 <1 <0.5 <3 <1 <2 - <2 <5 <2 - <2 - <2 <5 <2 <5 < , 80, , 60, 70, 80, , 60, 80, , 60, 75, 80, , 120, 140, 160, 180, , 70, 90, 110, 130** E E E E E E E , skin shiplap skin shiplap skin shiplap skin tongue & groove skin shiplap mortar topping tongue & groove grooved face & geotextile shiplap Floors - high load bearing Floors - very high load bearing Cavity wall - partial fill Pitched roofs insulation at rafter line Flat roofs Agricultural Inverted roofs ballasted Inverted roofs lightweight Basement walls external 92/ / / / /3431 9

10 Part L 2006 Guidance 6 April 2006 saw the introduction of changes to Part L of the Building Regulations in England and Wales. The changes are intended to: reduce the UK s emissions of greenhouse gases, particularly carbon dioxide. The operation of buildings accounts for 46% of the UK s carbon dioxide emissions; the intention behind the regulations is to reduce emissions for new buildings by 20-28% compared to the 2002 regulations. implement parts of the European Union s Energy Performance of Buildings Directive, which requires the introduction of standardised methods of assessing the energy efficiency of buildings. For dwellings the selected method is a revised version of the government s Standard Assessment Procedure (SAP 2005), whilst for other buildings the government has introduced the Simplified Building Energy Model (SBEM). reduce fuel poverty. Meeting Part L 2006 Requirements The latest changes to Part L of the Building Regulations complete the move towards a single compliance route for all new buildings. The change, which began in 1995 with the introduction of SAP ratings for new dwellings, requires designers to adopt a 'whole building' approach and to demonstrate that carbon dioxide emissions from the new building will not exceed a stipulated maximum. This holistic approach offers greater design flexibility but requires simultaneous consideration of all factors affecting energy efficiency including: type of building and its configuration siting and orientation fenestration elemental U-values air leakage rate thermal bridging space heating/solar gain/space cooling water heating lighting efficiency ventilation type of fuel (for dwellings only). Demonstrating compliance for extensions to and refurbishment of existing buildings, especially dwellings, will still rely heavily on elemental U-values. There are now four new Approved Documents: L1A New dwellings L1B Work on existing dwellings L2A New buildings other than dwellings L2B Work on existing buildings other than dwellings similar changes are expected to be introduced in Northern Ireland in November 2006 and in Scotland in 2007 Improvement factor LZC benchmark Overall improvement factor without LZC benchmark dwellings 20% N/A 20% non dwellings - naturally ventilated - mechanically ventilated - air conditioned 15% 20% 20% 10% 10% 10% 23.5% 28.0% 28.0% The LZC benchmark is intended to implement Article 5 of the EPBD by ensuring the use of LZC energy supply systems is considered before construction starts. Table 05 Improvement factors and low or zero carbon (LZC) benchmarks 10

11 Part L 2006 Guidance New buildings Approved Documents L1A & L2A These set out five criteria which must be met if a new building is to meet the requirements of Part L. The criteria apply to dwellings and to buildings other than dwellings, although the methods of demonstrating compliance vary between building types. 1. Achieving the Target carbon dioxide emission rate. Carbon dioxide emissions from the proposed building must be lower than a target rate. The process for calculating the target and design rates is: 1. calculate the carbon dioxide emissions per square metre of floor area from a notional building of the same dimensions as the proposed building, which would have passed the 2002 regulations by the Elemental method. see table apply an improvement factor and a low or zero carbon (LZC) benchmark (see table 05) to the calculated rate: the resultant figure is the Target carbon dioxide emission rate, the TER. For dwellings: TER = (C H x fuel factor + C L ) x (I - improvement factor) For dwellings (up to 450m2 floor area) the calculations use the SAP 2005 methodology implemented in an approved SAP program. For other buildings the calculations are performed by the SBEM, using software from the ODPM augmented if necessary by other approved software. Both methods take account of heat loss through air infiltration and thermal bridging. 2. Limits on design flexibility The emissions rating assessment allows designers considerable flexibility in the methods they employ to achieve the required rating. To ensure the building s fabric and services are reasonably energy efficient they must perform no worse than the limits set out in the Approved Documents - see table 07. An air permeability limit of 10m 3 /m 2 50Pa applies to all buildings. 3. Limiting the effects of solar gains in summer Lowering elemental U-values and improving airtightness bring a risk of building interiors overheating in summer as a result of solar gain. Both SAP and SBEM assessments will test for overheating and indicate if there is an excessive risk. C H = carbon dioxide emissions from heating and hot water C L = carbon dioxide emissions from lighting For non - dwellings: TER = Cnotional x (I - improvement factor) x (I - LZC benchmark) Cnotional = carbon dioxide emissions from a notional buiding 3. calculate the carbon dioxide emission rate for the proposed building: the Dwelling emission rate (DER) for dwellings, or the Building emission rate (BER) for other buildings. 4. the building meets the criterion if the DER or BER is equal to or lower than the TER. Dwellings Non - dwellings Walls Floors Roofs Pitched Flat 0.16 (0.25) Windows/Doors Table 06 Elemental U-values for 2002 notional buildings(w/m2.k) Area weighted average Worst for any sub-element Walls Floors Roofs Windows Doors a/3.0b a dwellings b non - dwellings Table 07 Limiting U-values New build (W/m2.K) 11

12 Part L 2006 Guidance 4. Quality of construction and commissioning The standard of construction must ensure the actual performance of the building is consistent with the predicted carbon dioxide emission rate. To achieve that: The thermal insulation must be reasonably continuous around the building envelope. Designers should use approved construction details or be able to demonstrate equivalent levels of performance in proposed alternative details. measured air permeabilities must be lower than the values used in the emissions calculation and less than 10m 3 /m 2 50Pa. Whilst all buildings other than dwellings must be tested, only a sample of dwellings within a development need be tested (the size of the sample depends upon the adoption of approved construction details and the results of the first test.) building services must be properly commissioned: in some cases that may involve air leakage testing of ductwork. 5. Operating and maintenance instructions. The owner of the building must be provided with sufficient information to enable the fixed building services to be efficiently operated and maintained. Existing buildings Approved Documents L1B & L2B Because existing buildings account for a substantial proportion of carbon dioxide emissions the revisions to Part L have raised performance standards for building fabric and services for extensions, material alterations and changes of use tables 08 and 09. Thermal element New Replacement Walls Floors Roofs Pitched (rafters) (joist) Flat Extensions to non-dwellings which are greater than 100m2 in floor area and more than 25% of the floor area in the existing building come under ADL2A If > 25% of surface area is to be renovated then whole element has to be upgraded to this level Dwellings Non - Dwellings Table 08 Extensions & Renovations U-values (W/m2.K) Windows Doors 3.0/ /6.0 Thermal element Threshold Improved Cavity Wall Other wall type Floors 0.70/ Roofs Pitched (rafters) (joist) Flat / If U-value is worse than threshold then upgrade to improved if economically viable (15 years payback or less) Dwellings Non - Dwellings Table 09 Upgrade of retained thermal elements U-values (W/m2.K) For buildings other than dwellings, work on extensions and initial fit out may require improvements to be made to existing services. Those consequential improvements may cost as much as 10% of the proposed work. Increases in the capacity of heating or cooling plant will require consequential improvements to the thermal elements: there is no cost limit on such improvements, but they should have a payback period not exceeding 15 years. 12

13 Part L 2006 Guidance Transitional arrangements Where work on site began before 6 April 2006 a building will only have to comply with the requirements of Part L Similarly, a building need only comply with Part L 2002 if the local authority has granted full plans approval before 6 April 2006 and work begins on site before 1 April In most other cases the building must meet the requirements of Part L 2006 see ODPM Circular 03/2006. Designers should consider a two stage approach: first, design the building to require the minimum amount of heating, cooling and lighting for its operation; secondly provide those services with the minimum carbon dioxide emissions. To do that designers may have to adopt different forms of construction and it may be that some constructions will be unable to give the performance required by the regulations. Implementing the regulations The key challenge for designers is to design buildings which will produce 20-28% less carbon dioxide emissions (some clients may, require buildings with emission levels much lower than the bare minimum set by Building Regulations). Insulation will continue to play a dominant role in achieving the carbon dioxide emissions targets in both new and existing buildings as can be see from table 10. Part L: 2006 ensures that the emphasis will not shift away from the long-term benefits of insulating the building fabric towards the short-term benefits of 'renewable' plant All buildings Dwellings Non - Dwellings Natural ventilation Mechanical ventilation LZC - 10% 0% 10% 0% Overall improvement factor 20% 15% 23.5% 20% 28% Flat roofs Floors Walls Pitched roofs Table U-values (W/m2.K): Impact on new build Shows the overall improvement factor required, including any compensation for not incorporating low or zero carbon technology. 13

14 Insulating inverted roofs Basic principles The performance and longevity of flat roofs depends upon many factors, including the position of the insulation within the construction. If insulation is placed below the structural deck (cold roof construction) the structure remains cold and there is a considerable risk of condensation; for that reason cold deck roofs are not recommended and are now seldom used. Insulation placed above the structural deck and beneath the waterproof layer (warm roof construction) reduces the risk of condensation but, because the waterproof layer is thermally isolated from the rest of the roof construction, it is exposed to wide temperature fluctuations with consequent increased risk of premature failure (Figure 01). The inverted roof concept overcomes the problem by placing thermal insulation above the waterproof layer, maintaining it at an even temperature close to that of the building interior and protecting it from the damaging effects of UV radiation and from mechanical damage. The insulation protects the waterproof covering from: wide temperature variations to -20 C. degradation from weathering. mechanical damage during construction, use and maintenance. The waterproof layer acts as a total vapour control layer and, being on the warm side of the insulation, is maintained above dewpoint temperature so the risk of condensation is eliminated. The inverted roof concept has other benefits. The insulation can be: installed in any weather. added to, without stripping the waterproof layer. easily lifted and replaced/re-used if the building is altered. The insulation for an inverted roof must: resist water absorption. be unaffected by freeze/thaw cycling. withstand surface traffic. protect the waterproof layer long term. be ballasted to prevent flotation. be protected from UV and mechanical damage. General recommendations on the design of inverted roofs are contained in BS Agrément certificate 97/3431 contains specific recommendations regarding the use of ROOFMATE insulation. Construction of the inverted roof In the inverted roof system insulation is laid over the waterproofing layer and suitably loaded to restrain it against flotation and wind uplift and to protect it against damage. Inverted roof constructions can be categorised as heavyweight or lightweight by reference to the form of building construction involved. If the structure incorporates protected membrane a concrete slab it will normally be cost-effective to design the slab to support the load of kg/m 2 imposed by Temperature C 0 unprotected membrane a ballasted inverted roof system (Figures 02 and 03). J F M A M J J A S O N D Figure 01 >> Temperature fluctuations in an unprotected roof covering compared with those in one protected by STYROFOAM 14

15 Insulating inverted roofs: basic principles Dow also offer an alternative inverted roof solution to suit lightweight, long span structures, capable of supporting a minimum nominal load of 30 kg/m 2. The lightweight inverted roof features a STYROFOAM board which, thanks to a bonded mortar topping and interlocking edge profile, does not require an additional ballast layer (Figure 04). This lightweight solution enables a far wider range of buildings to gain the benefits of the inverted roof system. Figure 02 >> Inverted roof with aggregate ballast The inverted roof concept is ideally suited to green roofs where the roof is covered with a plant-bearing layer (Figure 05). Green roofs may be used to: reduce a building's environmental impact. provide a garden area for projects where space is at a premium. contribute to a building's appearance. Roof loadings The basic roof structure may be of concrete, metal or timber: it must be strong enough to withstand the maximum predicted loads with a suitable factor of safety. Inverted roofs are subject to three main loads: dead loads: the self-weight of all the materials used: for calculation advice see BS 6399: Part 1. wind loads: the positive and negative pressures acting on the roof should be calculated using either the standard or directional method given in BS 6399: Part 2. imposed loads: see BS 6399: Part 3. Figure 03 >> Inverted roof with paving ballast Figure 04 >> Inverted roof on light-weight deck with self-ballasted insulation Figure 05 >> Inverted green roof 15

16 Insulating inverted roofs: basic principles Thermal performance Table 11 shows the thickness of insulation required to achieve the expected a range of U-values now required by Part L: In an inverted roof construction some rainwater will run off beneath the insulation boards and in doing so may draw heat from the deck. To compensate for this intermittent heat loss it is usual to increase the thickness of insulation by 20% (rainwater cooling penalty) or if the ROOFMATE MinK system is used this can be reduced to 2% - see page 16. U value Standard* 90mm 140mm 180mm 200mm 220mm ROOFMATE M in K system** 80mm 120mm 160mm 180mm 200mm Roof build-up: Ballast (aggregate or paving slabs) Separation layer (eg. ROOFMATE MK) ROOFMATE SL-X Separation layer Mastic asphalt 20mm Sand cement screed 50mm Concrete deck 200mm *20% rainwater cooling penalty **2% rainwater cooling penalty Table 11 Required ROOFMATE SL-X thickness to meet U-values (W/m2.K) Condensation The inverted roof construction can greatly reduce the risk of condensation in an existing building by keeping the roof structure and the waterproof layer above the dewpoint temperature. Where the building is likely to have a high level of humidity, as in the case of swimming pools or commercial kitchens, condensation risk assessment should be undertaken by a suitably qualified professional. A method for calculating the risk of interstitial condensation is given in BS EN ISO Roofs with high thermal capacity - such as concrete at least 50mm thick - do not undergo rapid cooling by rainwater run-off. Fire Inverted roofs ballasted with incombustible material, such as aggregate or paving slabs, readily achieve an external fire rating of FAA when tested to BS 476: Part 3: They offer adequate resistance to the external spread of fire as required by Building Regulation B4 (Regulation 19 in Scotland). For further information on the fire performance of ROOFMATE boards the STYROFOAM Solution for roofs see BS 6203 and Agrément Certificate 97/3431. Roof falls and drainage. Good drainage is vital to the long-term performance of a flat roof. To ensure the minimum finished fall of 1:80 recommended in BS 6229, falls should be designed to 1:40. Inverted roof construction can be used on flat roofs designed with falls up to 1:11. Falls must be consistent, without deflections or depressions in which large quantities of water may pond. To perform effectively, ROOFMATE boards must not be totally submerged. Guidance on the capacity and location of rainwater gutters and outlets is given in BS EN 12056: Part 3. Specify rainwater outlets which will accept run-off from both the top of the insulation and the surface of the waterproofing. Roof waterproofing The inverted roof concept can be used with a wide range of waterproofing materials, including mastic asphalt and high performance built-up bituminous felt (bituminous roofing felt with a core of organic fibre is not suitable). Where roofs do not have a fall, the waterproofing should be to a tanking specification. In renovation projects the inverted roof concept can be used to upgrade thermal performance of the roof: if the existing waterproof layer is in sound condition it may be retained but it may be desirable to overlay it with a new waterproof layer. 16

17 Insulating inverted roofs: basic principles Separating layers The recommendations for the use of separating layers in inverted roof construction are as follows: between waterproof layer and insulation: - mastic asphalt: BS 8218 requires a loose-laid nonwoven polyester fleece g/m 2 lapped mm. - bituminous felts: separating layer not normally required. - single ply polymeric membranes: a loose-laid nonwoven polyester fleece is normally recommended for ppvc membranes - consult the membrane supplier. between insulation and ballast: - to prevent fines from being washed under the insulation where they could damage the waterproof membrane use a loose-laid filter fabric, e.g. ROOFSTAT* N or ROOFSTAT R non-woven geotextiles. - to maintain the depth of ballast required to counter wind uplift at 50mm of washed 20-40mm nominal diameter aggregate irrespective of the insulation thickness, use a loose-laid non-woven geotextile with 140g/m 2 minimum density, e.g. ROOFSTAT R, lapped 300mm. *Tradename of Terram Ltd. 17

18 Insulating ballasted inverted roofs: design considerations General The inverted roof system is ideally suited to the insulation of flat roofs of heavyweight construction, and offers a durable, attractive roof finish for roofs where maintenance traffic is expected (Figure 06). The STYROFOAM Solution for insulating ballasted inverted roofs is ROOFMATE SL-X. ROOFMATE SL-X is designed to give the maximum benefit in inverted roof construction: a range of thicknesses from 50 to 200mm allows thermal performance to be matched to project requirements (see Table 06). shiplapped edges ensure a good interlock between boards, which helps prevent thermal bridging. rigid boards provide a firm base for the ballast layer. For the full physical properties and performance characteristics of ROOFMATE SL-X see Product Data. The ROOFMATE M in K system Allowing for rainwater cooling requires a 20% increase in insulation thickness. This can be reduced to 2% by use of the ROOFMATE MK separating layer together with ROOFMATE SL-X (see Agrément certificate 97/ the ROOFMATE MinK system). ROOFMATE MK is waterproof, but at the same time water vapour permeable. It replaces the usual separating layer laid between the insulation and ballast (see Figure 07). Rainwater is prevented from reaching the waterproofing layer, thereby almost completely eliminating the rainwater cooling effect. ROOFMATE MK should be loose-laid over the insulation, at right angles to the slope with 150mm laps running down the slope (or if the depth of the aggregate ballast is to kept to a maximum of 50mm then 300mm laps will be required.) At upstands and penetrations it should be turned up to finish above the surface of the ballast. ballast separating layer (if required) ROOFMATE SL-X separating layer (if required) waterproof layer concrete slab Figure 06 >> Ballasted inverted roof outlet guard ballast ROOFMATE MK separating layer ROOFMATE SL-X separating layer (if required) waterproof layer screed to falls ➇ concrete slab Figure 07 >> ROOFMATE M in K system in the inverted roof ➇ 18

19 Insulating ballasted inverted roofs: design considerations ROOFMATE MK is a spun bonded polyethylene geotextile with the following properties: water vapour permeable. water resistant. tear resistant. UV stable - can be left exposed outdoors for up to four months. fire - melts and shrinks away from a heat source (unclassifiable as regards Building Regulations). temperature - retains flexibility and toughness down to -73ºC, melting point is 135ºC. Ballast Both washed aggregate and dense concrete paving slabs are suitable as ballast for use with ROOFMATE SL-X insulation. Aggregate This gives a good appearance at an economical cost and should be 20-40mm nominal diameter, clean, washed and reasonably free from fines. The depth of aggregate required depends upon the thickness of the insulation and is shown in Table 07. When boards are overlaid with a suitable separating layer (see Page 15) - such as ROOFSTAT R or ROOFMATE MK - lapped 300mm, then a 50mm depth of aggregate may be sufficient to counter wind uplift and flotation of the insulation. Additional ballast may, however, be needed in those areas subject to greater wind uplift, such as perimeters. Aggregate should be replaced by paving slabs:- to form walkways where regular foot traffic is expected. where the kerb at the roof edge is too shallow to retain the aggregate. at perimeters, where calculations indicate aggregate will provide insufficient resistance to wind uplift or will be affected by wind scour. Paving slabs Table 08 lists the recommended thicknesses for paving slabs used to ballast an inverted roof. The slabs should be raised off the insulation on spacers to allow drainage and to avoid rocking. Alternatively, slabs may be set on a 20mm bed of pea gravel or sand spread over a layer of ROOFSTAT R. The pea gravel bedding will assist drainage, support low strength slabs, accommodate changes of level and allow the use of thinner slabs: 40mm slabs with a 20mm depth of bedding will impose a total load of 140kg/m 2. Thickness of ROOFMATE SL-X (mm) Depth of aggregate (mm) Approx weight of aggregate (kg/m2) >120 < >161 < assumes density of 16kg/m 2 per 10mm depth Table 12 Recommended depth of aggregate Thickness of ROOFMATE SL-X (mm) Thickness of paving slab (mm) 50, 60 not less than 40 70, , 120 not less than 50 >120 not less than 60 assumes dense concrete slabs to weigh approx. 25kg/m 2 per 10mm thickness Table 13 Recommended slab thicknesses see BRE Digest

20 Insulating ballasted inverted roofs: design considerations ➇ Edge details Upstands at parapets and abutments should be protected by ROOFMATE SL-X boards set vertically and covered with an apron flashing (Figure 08). Extending the insulation in this way affords a consistent level of protection and helps to avoid thermal bridging. Apron flashings should be carried to at least 150mm above the surface of the ballast. Kerbs, including those at verges and rooflights, should be high enough to contain the insulation and the ballast (Figure 09). ROOFMATE SL-X boards should be fitted tight against kerbs. apron flashing ROOFMATE SL-X ballast separating layer (if required) ROOFMATE SL-X separating layer (if required) waterproof layer ➇ concrete slab Figure 08 >> Ballasted inverted roof - detail at upstand Drains and gutters Outlet gratings may be raised on spacer rings to reduce the risk of blockage: cut a hole in the ROOFMATE SL-X boards to accommodate the outlets (Figure 10). A paving slab on spacer pads may be used above a flat grating (Figure 11). Where possible, line internal gutters with ROOFMATE SL-X to prevent thermal bridging, and maintain the ballast layer (Figure 12). Alternatively, the gutter may be spanned by ROOFMATE SL-X boards ballasted by paving slabs on spacer pads (Figure 13). Where the roof drains to an edge gutter terminate aggregate ballast with a row of paving slabs on suitable supports (figure 14) and protect the edge of the ROOFMATE SL-X boards from UV light with a cover flashing. cover flashing or capping ballast separating layer (if required) ROOFMATE SL-X separating layer (if required) waterproof layer concrete slab Figure 09 >> Ballasted inverted roof - detail at verge 20

21 Insulating ballasted inverted roofs: design considerations ➇ ➈ ballast waterproof layer outlet guard ballast separating layer (if required) ROOFMATE SL-X ➇ ➈ separating layer (if required) waterproof layer screed to falls concrete slab roof outlet separating layer (if required) ROOFMATE SL-X separating layer (if required) ROOFMATE SL-X concrete slab Figure 12 >> Ballasted inverted roof - insulation within internal gutter Figure 10 >> Ballasted inverted roof - drain with outlet guard paving slabs on spacer pads ROOFMATE SL-X separating layer (if required) waterproof layer screed to falls roof outlet concrete slab Figure 11 >> Ballasted inverted roof - outlet protected by paving slabs ballast separating layer (if required) ROOFMATE SL-X Figure 13 >> Ballasted inverted roof - insulation over internal gutter separating layer (if required) waterproof layer concrete slab ➇ paving slab on spacer pads separating layer (if required) ROOFMATE SL-X separating layer (if required) waterproof layer screed ➇ concrete slab flashing Figure 14 >> Ballasted inverted roof - detail at eaves 21

22 Insulating ballasted inverted roofs: design considerations Specification J21 Mastic asphalt roofing 710 Inverted roof insulation J41 Built-up felt roof coverings 710 Inverted roof insulation J42 Single layer polymeric roof coverings 810 Inverted roof insulation Manufacturer and reference: Dow Chemical Co. Ltd, Building Solutions, 2 Heathrow Boulevard, 284 Bath Road, West Drayton, Middlesex, UB7 0DQ. Tel: Fax: ROOFMATE SL-X Thickness : 50/60/80/100/120/140/160/180/200mm delete as appropriate Board size: 1250 x 600mm Edge profile: shiplap Design loading: 110kN/m 2 Fire Classification: Reaction to fire: BS EN Euroclass E Working temperature range: -50 C to +75 C. do not lay insulation until roof is clear of other subtrades. clean off all dirt and debris from base. lay separation layer as required. set out to minimise cutting and avoid small cut pieces at perimeters and penetrations. loose lay boards, tightly butted and to brick pattern, cut cleanly to fit closely around projections, upstands, rainwater outlets, etc. on completion of laying ensure boards are in good condition, with no springing, flexing or rocking. Secure boards against wind uplift as soon as practicable. Specify ballast layers with clauses 720, 730 or

23 Insulating ballast inverted roofs: installation methods Installation sequence 1. Inspect the roof to ensure it is clean. Plan the installation sequence and the layout of ROOFMATE SL-X boards. 2. Lay the separating layer (if required) over the waterproof layer; lap all edges by mm, at perimeters and penetrations turn up above the installed thickness of the insulation. 3. Lay ROOFMATE SL-X insulation boards in brick pattern with shiplap edges pushed together firmly (Figure 15). 4. Insulate upstands with ROOFMATE SL-X boards (Figure 08). 5. Fit ROOFMATE SL-X boards neatly around penetrations (Figure 16). Cut boards with a sharp knife or fine toothed saw. 6. Lay the filter layer (if required) with 150mm laps or if ROOFMATE MK 300mm laps at right angles to the slope. Arrange laps to run down the slope (Figure 17). At upstands and penetrations turn up the filter layer so it finishes above the surface of the ballast. 7. Lay paving slabs on supports around roof perimeters and penetrations as required. 8. Lay the ballast layer progressively. Work on an advancing front away from the point of access so all ballast material is carried across a protected waterproof layer (Figure 18). 9. Install cover flashings. Figure 15 Figure 16 Key points careful setting out before installation begins will minimise cutting and wastage. take care not to over-stress any area of the roof while distributing the ballast. use scaffold boards when barrowing materials over ROOFMATE SL-X boards. Figure 17 Figure 18 23

24 Insulating lightweight inverted roofs: design considerations General Lightweight inverted roofs are suitable for use with a wide range of waterproofing materials in both new and existing buildings where limited roof top access is expected (i.e. maintenance traffic only). The system is not suitable for use on heavily trafficked areas, such as balconies and terraces, nor should it be used with loose-laid membranes. U value 0.35 ROOFMATE LG-X (includes 10mm thick mortar topping) * * Roof build-up: ROOFMATE LG-X Separation layer Mastic asphalt 20mm Sand cement screed 50mm Concrete deck 200mm Rainwater cooling penalty calculated to BS EN ISO 6946 Annex D4 * 2 layers required eg. 160mm ROOFMATE SL-X + 60mm ROOFMATE LG-X * ROOFMATE LG-X separating layer (if required) Figure 19 >> Lightweight inverted roofs waterproof layer timber deck timber joist Table 14 Required ROOFMATE LG-X thickness (mm) to meet U-values (W/m2.K) Wind uplift ROOFMATE LG-X boards are designed to minimise the effect of wind uplift forces; the joints between boards are interlocking, but not airtight, so differences in pressure between the top and bottom surfaces of the boards - produced by wind blowing across the roof - rapidly equalise, reducing the uplift forces on the insulation. The STYROFOAM Solution for insulating lightweight inverted roofs is ROOFMATE LG-X: it consists of STYROFOAM insulation boards with a factory applied top surface of modified mortar 10mm thick. The surface is mottled grey, resembling a cement:sand render with a wood float finish. ROOFMATE LG-X is designed to give the maximum benefit in lightweight inverted roofs; the boards are: tongued and grooved on their long edges to ensure they lock together to give a continuous insulation layer, eliminating thermal bridging and reducing the effect of wind uplift. light enough for one man to handle. can be cut and shaped on site with a masonry saw. installed in one easy operation, avoiding the cost of a ballast layer. When assessing the effect of wind uplift upon ROOFMATE LG-X boards on a lightweight inverted roof it is important to consider: predicted uplift force: predictions of wind uplift should be based upon the calculation methods given in BS 6339: Part 2. means of attachment of the waterproof layer: waterproof layers on lightweight inverted roofs may be partially or fully adhered or mechanically attached: the weight of ROOFMATE LG-X boards should be ignored when assessing the stability of the waterproof layer under windload. laying pattern of boards: ROOFMATE LG-X boards must be laid in brick pattern with their tongued and grooved edges fully interlocked. Consult Page 08 for the full physical properties and performance characteristics of ROOFMATE LG-X boards. 24

25 Insulating lightweight inverted roofs: design considerations parapets and roof kerbs: at roof perimeters ROOFMATE LG-X boards must be protected from wind blowing directly underneath the boards: kerbs should extend at least 50mm above the top of the boards. On roofs with low wind exposure ROOFMATE LG-X boards may be laid to drain directly into an edge gutter. Protect the board edge with a cover flashing (Figure 20). edge restraint: the mortar topping to the ROOFMATE LG-X boards provides some resistance to uplift, but edge restraint is usually required at the roof perimeter and around large penetrations such as plant rooms. Edge restraint can be achieved by laying a single row of 50mm thick paving slabs or adhering the boards to the substrate with a suitable adhesive eg. Tixophalte*. If exceptionally high uplift forces are involved further rows of paving or possibly mechanical restraint will be required. paving slab ROOFMATE LG-X separating layer (if required) waterproof layer ➇ flashing screed to falls concrete slab WALLMATE CW-X Figure 20 >> Lightweight inverted roof- detail at eaves ➇ A ROOFMATE LG-X project assessment form is provided on page 34 of this brochure: the specifier should send a completed copy of the form to Dow for each project designed with ROOFMATE LG-X: on the basis of project information supplied Dow will calculate the amount and location of restraint required. For assistance in completing the form please contact Dow. Edge details Waterproof upstands should be protected by fitting ROOFMATE LG-X boards against the upstands and covering them with an apron flashing (Figure 21). Extending the insulation in this way also helps to avoid thermal bridging. ➇ ➈ Any apron flashing should terminate at least 150mm above the top of the boards. ➈ apron flashing ROOFMATE LG-X paving slab ROOFMATE LG-X WALLMATE CW-X ➇ ➈ separating layer (if required) waterproof layer screed to falls concrete slab WALLMATE CW-X Figure 21 >> Lightweight inverted roof - detail at upstand * available from Callenders Ltd. tel

26 Insulating lightweight inverted roofs: design considerations Drains and gutters Gratings for rainwater outlets may be raised on spacer rings to reduce the risk of blockage; cut a hole in the ROOFMATE LG-X board to accommodate the outlet. Alternatively, a paving slab supported on spacer pads may be used above a flat grating (Figure 22). paving slab on spacer pads ROOFMATE LG-X separating layer (if required) waterproof layer screed to falls concrete slab rainwater outlet Figure 22 >> Lightweight inverted roof - detail at outlet Specification J41 Built-up felt roof coverings 710 Inverted roof insulation J41 Built-up felt roof coverings 810 Inverted roof insulation J42 Single layer polymeric roof coverings 810 Inverted roof insulation Manufacturer and reference: Dow Chemical Co. Ltd, Building Solutions, 2 Heathrow Boulevard, 284 Bath Road, West Drayton, Middlesex, UB7 0DQ. Tel: Fax: ROOFMATE LG-X Roofs for maintenance traffic Thickness : 60/70/90/110/130 mm (including 10mm mortar topping) delete as appropriate thicker products available on request up to 190 mm Board size: 1200 x 600mm Edge profile: tongued and grooved on long sides, butt edged on short sides. Design loading: 110kN/m 2 Fire Classification: Reaction to fire: BS EN Euroclass E (insulation only) Working temperature range: -50 C to +75 C. do not lay insulation until roof is clear of other subtrades. clean off all dirt and debris from base. set out to minimise cutting and avoid small cut pieces at perimeters and penetrations. loose lay boards, tightly butted and to brick pattern, cut cleanly to fit closely around projections, upstands, rainwater outlets, etc. on completion of laying ensure boards are in good condition, with no springing, flexing or rocking. Secure boards against wind uplift as soon as practicable. 26

27 Insulating lightweight inverted roofs: installation methods Installation sequence 1. Inspect the roof to ensure it is clean. Plan the installation sequence and the layout of ROOFMATE LG-X boards. 2. Lay the separating layer (if required) over the waterproof layer; lap all edges by mm, at the perimeters and penetrations turn up above the installed thickness of the insulation. 3. Plan and set out ROOFMATE LG-X boards with 3-5mm between adjacent boards and between boards and upstands, kerbs and penetrations. 4. Start laying the first row of boards with their long edge against the longest side of the roof. If there is an angle fillet chamfer the board edges to get a good fit. 5. Do not use cut pieces of less than half board length at the perimeter: they may be used towards the roof centre. 6. Lay the second row of boards, staggered by half a board length, ensure the tongued and grooved edges interlock. 7. Stagger subsequent rows by half board lengths (Figure 23). 8. At penetrations cut the board across its width at the line of the penetration and neatly cut a shaped recess in each part so the edges of the ROOFMATE LG-X boards still interlock. 9. At changes in roof slope use a masonry saw to cut the mortar topping of the ROOFMATE LG-X boards along the line of change of plane. This will reduce cracking as the STYROFOAM insulation flexes under load. Leave the saw cut open. 10. Place the specified edge restraint along the roof perimeter and around large penetrations. 11. Install cover flashings. Key points careful setting out before installation begins will minimise cutting and wastage. when placing pallet loads of ROOFMATE LG-X onto the roof, distribute them to prevent overloading. keep the waterproof layer clear of debris throughout installation. protect ROOFMATE LG-X boards from damage by subsequent construction activity: replace any damaged boards. do not store unrestrained ROOFMATE LG-X boards on the roof. Mortar topping As with most mortar coatings, hairline cracks may develop in the mortar topping of ROOFMATE LG-X boards; such cracks will have no effect upon the performance of the product. They will not propagate, but will tend to heal as hydration of the cement continues. Accidental damage to the topping of ROOFMATE LG-X boards can be repaired in-situ using a suitable latexmodified cement. Figure 23 27

28 Insulating green roofs: design considerations General Flat roofs of suitable construction may be used to provide planted or landscaped areas which can offer a valuable amenity within the built environment. Such 'green' roofs can enhance the appearance of the building and provide additional outdoor facilities for building users. An inverted roof with ROOFMATE insulation is the ideal solution for 'green' roofs where landscaping or planting is provided. The insulation boards protect the waterproof layer and the planting provides necessary ballast (Figures 24 and 25). The STYROFOAM Solution for insulating green roofs is ROOFMATE SL-X. ROOFMATE SL-X is designed to give the maximum benefit in inverted roof construction; it is: rot proof - performance unaffected by conditions below the plant-bearing layer. available in a range of thicknesses from 50mm to 200mm allow thermal performance to be matched to project requirements. made with shiplapped edges to ensure a good interlock between boards, preventing thermal bridging. Consult Page 08 for the full physical properties and performance characteristics of ROOFMATE SL-X. Waterproof layers Suitable waterproof layers for green roof constructions planting / drainage layer (50-150mm) filter layer ROOFMATE SL-X separating layer (if required) waterproof layer concrete slab include: mastic asphalt. modified bitumen membranes. Figure 24 >> Extensive green roof The ROOFMATE SL-X boards will help protect the waterproof layer from root penetration: consult the membrane manufacturer for information on suitability and protection. ➇ planting layer ( mm) filter layer drainage layer ROOFMATE SL-X separating layer (if required) waterproof layer filter layer ➇ concrete slab Figure 25 >> Intensive green roof 28

29 Insulating green roofs: design considerations Filter layers Filter layers will be required above the drainage layer and the insulation to prevent fines being washed down to the drainage and waterproof layers. Suitable materials include geotextiles with minimum weight of 140g/m 2, such as ROOFSTAT R. Planting The planting on a green roof may be: extensive: using a thin plant-bearing layer (50-150mm) and hardy plants such as sedums and grasses. Extensive green roofs are not usually intended for access. Once the planting is established - which may take only a few months - it requires very little maintenance (Figure 24). intensive: using a thick plant-bearing layer ( mm) and traditional garden plants including lawn-grass, shrubs and even small trees. Intensive green roofs require full access for maintenance, are suitable for roof gardens and are often combined with paved areas and terraces to provide amenity areas. The type of planting chosen will determine the roof construction above the filter layer: extensive planting requires a planting layer which will retain some water whilst intensive planting requires a thicker, soil-based plant-bearing layer and a drainage layer (Figure 25). Loading The load imposed by saturated soil can be as high as 25kg/m 2 per 10mm depth, and that of the gravel drainage layer 16kg/m 2 per 10mm depth. A further load of 20kg/m 2 should be allowed for water logging of the gravel drainage layer (minimum 50mm depth). Specification J21 Mastic asphalt roofing 710 Inverted roof insulation J41 Built-up felt roof coverings 710 Inverted roof insulation J42 Single layer polymeric roof coverings 810 Inverted roof insulation Manufacturer and reference: Dow Chemical Co. Ltd, Building Solutions, 2 Heathrow Boulevard, 284 Bath Road, West Drayton, Middlesex, UB7 0DQ. Tel: Fax: ROOFMATE SL-X Thickness : 50/60/75/80/90/100/120/140/160/180/200mm delete as appropriate Board size: 1250 x 600mm Edge profile: shiplap Design loading: 110kN/m 2 Fire Classification: Reaction to fire: BS EN Euroclass E Working temperature range: -50 C to +75 C. do not lay insulation until roof is clear of other subtrades. clean off all dirt and debris from base. set out to minimise cutting and avoid small cut pieces at perimeters and penetrations. loose lay boards, tightly butted and to brick pattern, cut cleanly to fit closely around projections, upstands, rainwater outlets, etc. on completion of laying ensure boards are in good condition, with no springing, flexing or rocking. Secure boards against wind uplift as soon as practicable. Specify the green roof covering with clause

30 Insulating green roofs: installation methods Installation sequence 1. Inspect the roof to ensure it is clean. Plan the installation sequence and the layout of ROOFMATE SL-X boards. 2. Lay the separating layer (if required) over the waterproof layer; lap all edges by mm, at perimeters and penetrations turn up above the installed thickness of the insulation. 3. Lay ROOFMATE SL-X insulation boards in brick pattern with shiplap edges pushed together firmly. 4. Insulate upstands with ROOFMATE SL-X boards. 5. Fit ROOFMATE SL-X boards neatly around penetrations. Cut boards with a sharp knife or fine toothed saw. 6. Lay the filter layer with 150mm laps at right angles to the slope. Arrange laps to run down the slope. Turn up the filter layer at upstands and penetrations. 7. Proceed with drainage layer, (50mm deep gravel graded 20-30mm) soil and planting, taking care not to disturb the ROOFMATE SL-X boards and filter layer. Key points careful setting out before installation begins will minimise cutting and wastage. work on an advancing front away from the point of access so all loading material is carried across a protected waterproof layer. take care not to over-stress any area of the roof while distributing the soil layer. use scaffold boards when wheel barrowing materials over ROOFMATE SL-X boards. 30